Fuse



J. N. NENONEN FUSE Filed June 19 1925 Patented Doc. 23, 1924-.

PATENT OFFICE.

JOHHVN. mom, F ABERDEEN, WASHINGTON.

FUSE.

Application knee June 19, 192;. Serial No. 648,347.

To all whore it may concern:

Be it :known that I, JOHN N. NnNoimN,

a citizen of Finland, residing at Aberdeen, in the county of Grays Harbor and State of Washington, have invented certain new and useful Improvements in a Fuse,- of which the following is a specification.

I, This invention relates to fuse-plugs and more particularly to an improvedkstructurefor fuse plugs adapted to readilydisclose to an observer the condition of the plug with respect to the fusible element therein.

One of the objects of the invention is to provide a fuse plug-in which the defective condition of the plug may be easily detected after the fusible wire blows out.

Other objects of the'invention will appear upon consideration of the following detailed description and accompanying drawings in which: 7

Figure 1 is a cross section through the P s .o

F1gure'2 1s a plan View, a

' Fifilsle 3 i'sa similar view showing the signal and f Figure 4 is a perspective view of the warnin slgnal.

he plug 1 comprises the housing of the ordinary type except that in the present form one wall of the housing on the interior thereof is provided with a recess 2. .The side terminal '3 is mounted on the shank of the plug and isscrewthreaded in the usual man ner, whereby the plug may be mounted in position. .The top of the plug is provided with a removable cap or ring 4 adaptedv to hold a transparent and 5 constructed of mica or other suitab e transparent material, whereby an observer may new the interior of the plug housing. A centrally located spring rod is mounted within the housing and this spring rod, indicated at 6, has its lower end extended through the end of the housing and carries the bottom terminal plate 7. This rod 6'is of spring material and as its upper end provided with a colored disc 8. The disc is preferably of a bright color which may be readily observed through the transparent panel 5. A fusible link 9 is mounted in the recess 10 in the housing and is soldered to the side terminal 3 and the s ring rod 6. Since this link is relatively short, the spring rod 6 is thereby pulled over to one side of the housing so that the is lodgeddn the recess 2.

The fusible link 9 is constructed of the usual fusible material and when an excess current occurs it will be obvious that the link will be broken so that the spring rod 6 will spring to the position shown by dotted llnes in Figure, 1, thus vcausing the CO1? cred disc 8 .to be exposed in a position where 1t will be readily observed through thetransparent panel 5, thus indicating to the observer that the plug is defective.

Minor changes may be made in the details of construction without departing from the spirit ofthe invention or the claims hereunder appended.

What I claim is:

1. A fuse plug comprising a hollow body having 1ts wall provided with a recess, side terminal mounted on the body, a bottom termlnal on the end of the body, a sprin rod connected to the sad bottom termina and adapted to norma 1y extend centrall through the said body, and a; fusible connected to the said side terminal and extending through the body and joined to the said spring rod for maintaining the spring rod under a tension whereby the free end of the rod will be held resiliently in the said recess.

2. A fuse plug comprisin a lu bod having a hollow interior, tl ie w dll of at body being provided with a recess and an scope of the v opening, a transparent cap for one end of 7' the said body, the opposite end of the body being provided with a bottom terminal, a side terminalon the said body, a spring rod connected to the bottom terminal and extendlng through the said hollow body, a. colored 0 carried on the free end of the said rod, anda fuse link connected to the said side terminal and projectin through the said opening lathe body to be connected to the said spring rqd whereb it will releasably hold t e said spring ro in a curved position to maintain the said colored disc in the said recess until the said link is released.

In testimony whereof, I have ailixed my signature in the presence of two witnesses.

JOHN N. NENONEN. Witnesses: 

